How can I tell if the FBH is working right on my discovery 3. I get a bit of a paraffin smell but as far as I can tel no difference to cabin getting hotter quicker or can I see a smoke from front passenger side wheel arch. I am guessing the fbh exhaust outlet is u set body at front of wheel arch and is the metal pipe there. I can feel hot air coming from or but cannot see any smoke.

Cheers

5th Nov 2017 9:32 pm

DSLKeeper of the wheelie bin

Member Since: 11 May 2006
Location: Somewhere.
Posts: 58013

Sounds about right.

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If the smoke is coming out and the pipe is hot, the; that’s pretty much it. I believe it just assists the engine in warming the coolant, so the cabin doesn’t just get hot.2016 D4 Graphite Santorini Black
1994 Defender 90
2012 D4 XS Orkney Grey missing it already
2005 D3 S Maya Gold - Gone but never forgotten

It should only smoke a little as its starts and that it, if it keeps on smoking its needs some tlc, when they are running right they will be blowing red hot air out of the little exhaust pipe with zero smoke.
I notice the car gets to operating temp faster so the cabin gets warmer (if thats the right word!) faster and er thats it.No Illeism here.

6th Nov 2017 7:22 am

Oscarsball

Member Since: 29 Apr 2017
Location: East Sussex
Posts: 48

Thanks all
Definitely red hot air coming from fbh exhaust so think it is working then.
It was very cold this morning when I started and I am pretty certain the gauge seemed to get up quicker so seems good.